I am currently using a Cisco ASA5510 with NAT confogured for passinfg to my email server. Remote users use OWA for email access. This all works fine now. I am installing a Sophos email appliance. If I chnage the internal NAT address to that of the email appliance I lose OWA access. I could configure OWA on another external address and set up the rules accordingly but I am trying to use the existing external address to avoid having to redo the OWA shortcut on all 100 laptops in the field. Any ideas how I can make the existing addressing and config work?